Question about 2005 Mercury Monterey

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2005 Merc Monterey - A/C cold on passenger side, HOT on driver's side. Already tested every fuse that had anything to do with A/C, they are all fine, all fuses are good. Any ideas for me??? TY

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  • eblaker3 Aug 04, 2009

    NOPE, I dug a little deeper on the Internet and found the answer for FREE. There is a special procedure to reset the A/C's section in the car's processor...

    TY, but I am going to ask this website for a refund. I actually answered this question for someone else who asked it before (in July) on this very site!

    Incidentally, had I gone to a mechanic, he probably would have done (something like) what you said and started replacing things. Had they disconnected the battery to do the job, the computer would have reset and EVEN THEY would have thought they did the right thing when really new parts WERE NOT the answer. I would have gotten charged for labor and parts for nothing...

    I am not an auto mechanic, however electronics was my major in college, I am an audio expert for over 25 years, computer technician since 1987 (from Atari to Mac & PC) and am an EXCELLENT trouble shooter who knows how to exercise the process of elimination from the simplest point on up. The whole thing took me about 10 minutes to resolve after I didn't hear an answer on this website (including finding the answer & going through the reset steps).

    When I tested all the fuses with an OHMeter then checked the hoses for leaks and found none, I realized moving to the next step would be to reset the computer. I DIDN'T even go as far as disconnecting the battery for 15 minutes, but found THE EXACT procedure for resetting the A/C - HEATER section in the processor.

    Having worked closely with large manufacturer's and their engineer/designers in the past, I know how companies force these people to think / act & design. It costs manufacturers MILLIONS to tool up for changes. So, they usually try to keep things that work for long periods to save money (like whole or clusters of circuitry in processors/computers). Proof of this is that I used the SAME reset procedure from a 1998 Mercury with the same problem!!! It worked like a charm and the A/C is blowing as cold as ICE!

    I don't remember the proceedure exactly, however it entails "ignition on, heater off button twice, shut ignition off - wait 30 seconds, turn ignition on for 3 minutes, then start car from on position). You can read it exactly, if you look it up on THIS site and see my answer to the person who asked it in July. PS - I should have KNOWN I wouldn't find the answer on here, because that person's question had gone unanswered (duh, my own fault!).

    Anyway, the bottom line is nobody knows everything, but chances are, if you dig deep enough, SOMEONE is gonna know what you need to find out! The internet is a GREAT place if you know how to use it and you seek out another tech-head "geek" like one's self. Plus the ability to reason and troubleshoot cuts out the guess work.

    An interesting thing (in this particular case) would be to note that (and I can't say for sure, just speculating here) but due to the fact that this system needed a reset, it is quite possible that even an expensive diagnostic machine might have come up with the same answer you did! That is something to ponder and if I could recreate this exactly, I would LOVE the opportunity to go through that process and see what the diagnostic machine would have to say!!!

    My gut feeling as to why this even happened in the first place is a static charge from lightening! I live in Florida and it has been storming here for a while and it strikes real close around here. Computers are sesitive to static charge and when it comes to lightening extremely weird things can happen. This year, we already lost a DVD recorder, a TV and the modem in our TiVo (the Tivo thing was due to the phone company's crappy, shorted old wiring in our townhouse)! All four of these incidents (the car and all the equipment) resulted immediately after some NASTY thunder storms!!!

    Good luck to you my friend, thanks for responding and have a GREAT day!

    Sincerely,
    EB

  • eblaker3 Aug 04, 2009

    Here is the URL with my answer to that other person:
    http://www.fixya.com/cars/t2533535-c_onl...
    It is solution #2
    :-)

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  • Mercury Master
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Sounds like vent actuator under dash on drivers side needs to be replaced. Your problem sounds like the common blend door problem on the Fords. The door is on a vertical axis and when it breaks, it can swing back and forth randomly giving heat or AC or nothing. The difference on acceleration is the force placed on the door swinging it one direction. 
You can check the operation by fully, removing the actuator motor on top of the plenum box and examining the blend door axle. Pictures of the common fail signature are available on the heatertreater.net web site. There are several "free" fixes that mostly are worth what you pay for them. The solution on the web site is solid and proven over hundreds of vehicles and will resolve the problem once and for all.

http://www.heatertreater.net/Windstar%20Listing.html

Good luck my friend. 

Posted on Aug 04, 2009

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  • Master
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Most Likley The Part below
Electronic Automatic Temperature Control (EATC) Module

Posted on Aug 01, 2009

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